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Front cover/dust cap for OT C8

Started by Terra Nova , Mar 06 2018 12:22 PM

Celestron catadioptric cassegrain classic

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138 replies to this topic

#126 Paul Rini

Explorer 1

Posts: 89
Joined: 19 Nov 2012

Posted 24 March 2018 - 07:11 AM

Being an optician I guess it is habit of looking at reflections.....like the one on the cabinet window while photographing the above C8. Nice strong counterweight setup.....real nice

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#127 jcj380

Aurora

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Joined: 08 Jul 2014

Posted 27 March 2018 - 07:51 AM

Did you put an extension on the focus knob or is that just a newer design than mine?

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#128 Terra Nova

ISS

topic starter

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Joined: 29 May 2012

Posted 27 March 2018 - 09:36 AM

Did you put an extension on the focus knob or is that just a newer design than mine?

I did nothing to the focuser. It’s the way I got it.

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#129 JakeJ

Mercury-Atlas

Posts: 2,661
Joined: 31 Aug 2004

Posted 27 March 2018 - 11:24 AM

I did nothing to the focuser. It’s the way I got it.

It does look longer. Here is the focuser knob on my orange C8. That being said, mine is later production with the plastic secondary holder.

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#130 jcj380

Aurora

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Posted 27 March 2018 - 12:23 PM

Mine is identical to Jake's.

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#131 B 26354

Soyuz

Posts: 3,685
Joined: 05 Jan 2017

Posted 27 March 2018 - 01:45 PM

Mine is a '77 -- which I bought new -- and it's identical to Terra's.

Edited by B 26354, 27 March 2018 - 01:45 PM.

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#132 JakeJ

Mercury-Atlas

Posts: 2,661
Joined: 31 Aug 2004

Posted 27 March 2018 - 02:28 PM

Mine is a '77 -- which I bought new -- and it's identical to Terra's.

Metal secondary?

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#133 B 26354

Soyuz

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Joined: 05 Jan 2017

Posted 27 March 2018 - 04:59 PM

Metal secondary?

Yep.

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#134 Geo31

Hubble

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Joined: 28 Jan 2013

Posted 27 March 2018 - 08:52 PM

Metal secondary?

Mine's glass.

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#135 jcj380

Aurora

Posts: 4,811
Joined: 08 Jul 2014

Posted 28 March 2018 - 09:08 AM

Mine is a '77 -- which I bought new -- and it's identical to Terra's.

Makes sense. I bought mine new around '79 or '80.

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#136 Richard Ozer

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Posts: 16
Joined: 26 Aug 2007

Posted 26 November 2020 - 07:05 PM

Getting back to dust covers for an original C8... lol

I'm going to try this:

https://www.amazon.c...=8-2&th=1&psc=1

And then use some sticky-back foam insulation strips on the inside of the cap to create a snug fit.

I'll let you know how it goes.

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#137 B 26354

Soyuz

Posts: 3,685
Joined: 05 Jan 2017

Posted 27 November 2020 - 01:32 AM

Wow. What an interesting idea. Never knew such a thing existed. Seems that some of these are made from more flexible plastic than others. My only concern would be that the plastic that the flexible ones are made from might possibly out-gas onto the corrector plate, over time.

Keep us posted!

Edited by B 26354, 27 November 2020 - 10:31 AM.

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#138 Richard Ozer

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Posts: 16
Joined: 26 Aug 2007

Posted 27 November 2020 - 01:40 PM

Wow. What an interesting idea. Never knew such a thing existed. Seems that some of these are made from more flexible plastic than others. My only concern would be that the plastic that the flexible ones are made from might possibly out-gas onto the corrector plate, over time.

Keep us posted!

I think the outgassing from the cap will be far less than the outgassing from the owner.